Electric water heater



Oct. 28, 1930. M. s. GAZELLE ELECTRIC WATER HEATER Filed July 12 1929 2V2 mgwoR BY 94 azvziud ATTORNEY Patented Oct. 28, 1930 UNITED STATES-- PA TEN-T OFFICE MICHEL S. GAZELLE, OF DETROIT, MICHIGAN ELECTRIC WATER HEATER Application filed; .Tuly' 12,

My invention relates to anelectric water heater for use 1n connection with the usual range boiler or'tank employed for domestic water heating,it being obvious however 5 that it may be used for heating water for heated.

One feature of the invention consists in providing a plurality of concentrically arranged sheet pair of annular concentricsheet metal rings welded to each end of the shells, thereby pro- 0 water jacket viding a closed outer chamber, or dead air insulating wall, surrounding aninner annular water chamber, whereby the heat-from a heating coil extending axially through the latter may be conserved to insure rapid heating of the water passing through the surrounding water chamber.

A further obj est-o1"? the invention is to'provide a device whereby the heating coil and may be-readily enlarged by coupling two or-more sections together to meet the requirements necessary for heating water in tanks of various capacities.

A further object of the invention is to provide means whereby the water in the range boiler may be automatically maintained at a predetermined temperature at all times, regardless of the volume of water that may have been drawn from the tank from time to time,the operation being such that upon the water in the tank reaching a predetermined temperature, the electric current delivered from a service station will be automatically cut'oif from the heating coils.

With the foregoing and other objects in view which will appear as the description proceeds, the invention further resides-in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being-understood that metal shells spaced apart by a 1929.. Serial No. 377,886.

changes may be made in the precise embodiment or the invention herein disclosed without dep In th fication arting from the spirit of the same. e drawlngs' accompanying this speci- Figure l is a vertical, or longitudinal sectional view of the dev1ce, dependent upon its posit ion when installed.

Figure 2 is a cross-sectional view taken on or about line 22 of F igure 1.

Figure 3'is an with its lower end tion' to horizon elevation of a range boiler,

broken away and'in secheating device installed within a chamber beneath the disclose the tally boiler, fitted with a door,-shown in dotted l nes, -whereby access may be had to the heater.

Referring now to the letters of reference placed The main body of the device three annular upon the drawings:

comprises walls A, B, C concentrically arranged in spacedrelation to each other to provide annular chambers, the ends of the annular chambers being closed by concentric rings A and B, welded to each end of the respecti annular ve annular walls, thereby forming an water'chamber D, and an encirclmg dead air heat insulatingchamber E.

Pro ectlng outwardly from the end walls of the water chamber D welded thereto,

passes t Spaced from the D are nipplesD and through which water 0 and from the chamber.

ends of the main body of the device are cup-shaped water chambers F and F inner and outer walls F and F b by an annular ring G, welded to the cup-shaped walls, thereby closed formed of sheet metal comprising spaced apart the edges of providing a dead air chamber or heat insulating wall surrounding the water chamber at each end of t water c a wall G from which welded nipples the device.

each cup-shaped and welded thereto is project nipples G G*, to the wall and connected with the D and D of the water chamber D,

he main body portion of hamber F, F

by coupling nuts D H are pipe nipples welded in axial alignment respectively to the walls of the cup-ska ped water-chambers at'each end of the 7 water chamber" at each I leading to the heating device.

the range boiler.

able ring overlaps and conceals the junction between 'iabuttingjsections of the body-pore tion. V a P K'denotes a heatingcoil extending axially within the bore of the annular water cham-j' ber..

Y Lindicates aporcelain disc at each end, of the water chamber provided with a pair of holes through which the nipples D and D project. a. r

M'denotes a spring located between the wall G of the cup-shapedvwater chamber F andthe porcelain disc L, and M a spring betweenthe disc and the end'of the heating coil to maintain the: respective elements in.

spaced relation to each other.

N designates a range-boiler provided at its lower end with a chamber N in which is lodged the heating device.

N denotes a door, shown in dotted lines, whereby access maybe gained to the heating device for inspection-or repairs.

P indicates a cold water pipe connected with the water supply system extending downwardly to a point near the bottom of i indicates a cold water pipe projecting into the range boiler connected'with the pipe 1 denotes a hot waterpipe leading from the'heatin'g device and preferably discharging into the range boiler adjacentits upper end. P designates ahot water pipe leading from the top of the'range boiler to thehouse service P pe a Rindicates diagrammatically a thermostat controlling thedelivery of electric current from the service wires to the heating coil of thedevice whereby the current may be antomaticallyY cut-ofi from the heating coil whenever the temperature of the wateri-n the range boiler reaches a predetermined degree as will be readily understood, and when the temperatureot the water in the tank is lowered below; said predetermineddegree, the

thermostatic switch will beclosed automat ica'lly for the delivery of: current to the heating coil.

Having indicated the several parts by retwhereby additional.

supply of current the heating capacity amanner of the device ;in which case a similar slid- 1 tending aaxially erence letters, the construction and operation of the device will be readily understood.

The thermostat having been set for a predetermined water temperature, the heating coils will cause the water,-if below the desired temperature in the water chamber, to rapidly-heat the water therein, causingit'to circulate through the water. tank of the range boiler, until the temperature of the water in the latter reaches the desired-predeterini ed temperature, whereupon the thermostat will automatically cut oli the from the servicestation in which. i Well understood.

By drawing water from the tank from time to time, the incoming cold water deliveredto the tank from the service main will eventual chamber into the V ly lower the temperature-or the water there-.; v

in, suliiciently to cause the, thermostatic switch to automatically close the electric cir cuit from the service station to the heating coils, that the latter may heat thewater. until the temperature in the range boiler is restored to its vformer degree, whereupon the circuit will be cut otljasbefore, 1-

Having thus described my invention, what I claimis: A

1. Inan electric water heater a main body portioncomprising aplurality otsheet metal shells concentrically disposed in spaced relation to eachother; a plurality otannular sheet metal rings welded to each end of the;

sheet metal shells, to provide both an inner;

water chamber and an encircling outer dead. air heat-insulating chamber, surrounding'the water chamber; an electric heating coilenwithin the annular water chamber; a pair of-cup-shaped water chambers respectively located at-eachend and inspaced relation to .the main v body portion an outer cup-shaped wall inclosing each cupshaped water chamber an annularring-welded to the walls of said water chambers and their outer inclosingwalls ;a wall bridging the annularwall ofEeach cuprshaped water chamber a fpluralityof pipe nipples. connect ing the respective cuprshap'ed waterchanr-l bers with theannular waterchamberg and Water. inlet and-outlet pipe connection extending respectively fromeach otthe cup-- shaped water chambers. l 2. In an electric water heater,a main body portion comprising .a plurality of cylindrical sheet metal shells concentrically disposedin I Welded to the Walls of said Water chambers and their outer inclosing Walls to maintain them in spaced relation; a Wall bridging the annular rim of each cup-shaped Water chamher; a plurality of pipe nipples projecting from the Walls of the cup-shaped Water chambers and Welded thereto; a plurality of pipe nipples projecting from the end rings of the annular Water chamber in coupling alignment with the nipples of the cup-shaped Water chambers; means for coupling said nipples together; and a Water inlet and outlet pipe coupling nipple, respectively Welded to the inner and outer inclosing Walls of said cup-shaped chambers, adapted for connection With Water pipes leading to and from the Water heater.

3. A structure as specified in claim 2 in combination With a plurality of collars slidably mounted upon the main body portion, adapted to bridge the space between the ends of the latter and the cup-shaped water charm bers.

4. A structure as specified in claim 2 in combination With a plurality of porcelain discs located in spaced relation to the end of the heating coil; and a pair of springs respectively located on each side of one of said discs.

5. A device as specified in claim 2 in combination with a range boiler; pipes leading from the range boiler to the heater and from the heater back to the boiler; service Wires connecting the heating coil With a source of electrical energy; and means controlled by the temperature of the Water in the range boiler adapted to automatically establish or cut-oif the current to said heating coil.

In testimony whereof, I sign this specification.

MIGHEL S. GAZELLE. 

